public class Demo1 {
    private static int count;
    public static Object lock=new Object();
    public static Object lock2=new Object();

    public static void main(String[] args) throws InterruptedException {
    Thread t1=new Thread(()->{
        for (int i = 0; i < 50000; i++) {
                synchronized (lock) {
                    count++;
                }
        }
    });
        Thread t2=new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                synchronized (lock2) {
                    count++;
                }

            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count="+count);
    }
}
